I recorded a script that is working (in raw Mode, basic mode never works) but it only works for like 10 minutes.
When I click test in the reconnect settings the script runs and after 20s I get a new IP and Jdownloader acknowledges that. Everything fine.

If I run the same script 10 minutes later the reconnect isnt working anymore.
I can record a new script once more, the new one might work again but still only for some limited amount of time.

if it typically works while recording then on test doesn't it means there is some variable (Dynamic) content in requests. You need to find that content within the HTML and input it within the next request.

I recorded two scripts in RAW mode. Both worked initially and then not anymore.

They are identical up to this point in the code.
the cmp and session values differ between the scripts and as you can see, the session value even changes within a single script.
Both scripts use the same Cookie all the time.